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The (Hagelin) CD-57 was a portable, mechanical cipher machine manufactured by
Sullivan (2002) shows how the CD-57 can be attacked using a
Photographs and a simulator (Windows)
* Photographs of the CD-57
* Jerry Proc's pages
Information about the STG-61
{{Cryptography navbox , machines Encryption devices
The (Hagelin) CD-57 was a portable, mechanical cipher machine manufactured by Crypto AG
Crypto AG was a Swiss company specialising in communications and information security founded by Boris Hagelin in 1952. The company was secretly purchased for US $5.75 million and jointly owned by the American Central Intelligence Agency (CIA) a ...
, first produced in 1957. It was derived from the earlier CD-55, and was designed to be compatible with the larger C-52 machines. Compact, the CD-57 measured merely 5 1/8in × 3 1/8in × 1 1/2in (13 × 8 × 3.8 cm) and weighed 1.5 pounds (680 gr). The CD-57 used six wheels.
A variant is the CD-57(RT), a similar device using a one-time pad
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single-use pre-shared key that is not smaller than the message being sent. In this technique, a plaintext is paired with a ran ...
system rather than rotating wheels. The STG-61 was a licensed copy of the CD-57 by Hell.Sullivan (2002) shows how the CD-57 can be attacked using a
hill climbing
numerical analysis, hill climbing is a mathematical optimization technique which belongs to the family of local search. It is an iterative algorithm that starts with an arbitrary solution to a problem, then attempts to find a better solution ...
search technique.
See also
*M-209
In cryptography, the M-209, designated CSP-1500 by the United States Navy (C-38 by the manufacturer) is a portable, mechanical cipher machine used by the US military primarily in World War II, though it remained in active use through the Korean W ...
Notes
References
* Wayne G. Baker, Solving a Hagelin, Type CD-57, Cipher, ''Cryptologia'', 2(1), January 1978, pp1–8. * Louis Kruh, Cipher Equipment: Hagelin Pocket Cryptographer, Type CD-57, ''Cryptologia'', Volume 1, 1977, pp255–260. * Geoff Sullivan, Cryptanalysis of Hagelin machine pin wheels, ''Cryptologia'', 26(4), pp257–273, October 2002.External links
Photographs and a simulator (Windows)
* Photographs of the CD-57
* Jerry Proc's pages
Information about the STG-61
{{Cryptography navbox , machines Encryption devices